San Diego-based Achates Power sees a future for internal combustion engines with its opposed-piston design. The company recently received venture capital and a new U.S. Army contract. This is a three-cylinder engine with six pistons. Image courtesy of Achates Power INC.

San Diego-based Achates Power sees a future for internal combustion engines with its opposed-piston design. The company recently received venture capital and a new U.S. Army contract. This is a three-cylinder engine with six pistons. Image courtesy of Achates Power INC.

— Don’t count on the gas engine to go away just yet...

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